The message
from Chris Wilson contains these words:

What exactly is agricultural grist (as in grass seed) and why does the
label say "Not intended for sowing"?

I was recommended to use this to rough seed some areas around a bird
compound perimeter in woodland. The label has rather fazed me... :-)

Grain. As in 'grist to the mill'.

Agricultural grist is I know not what, despite having kept cattle.
Probably seed intended for addition to fodder.

--
Rusty Hinge
horrid·squeak&zetnet·co·uk
http://www.users.zetnet.co.uk/hi-fi/tqt.htm